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Asia, Vietnam, Hue. Citadel gate. Designated a UNESCO World Heritage Site in 1993, Hue is honoured for its complex of historic monuments. The seat of the Nguyen emperors was in the Citadel, which occupies a large, walled area on the north side of the Perfume river. Inside the citadel was a forbidden city where only the concubines, emperors, and those close enough to them were granted access, the punishment for trespassing being death.